1. The document discusses the concepts of structural robustness and resilience for structural and infrastructure systems. 2. It examines attributes like reliability, availability, safety, and integrity and threats like failure, error, and faults that can impact system performance. 3. The document presents approaches for improving dependability, including fault tolerant design, fault detection and diagnosis, and structural health monitoring to assess damage and remaining capacity.

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Robustezza e Resilienza
di Sistemi Strutturali e Infrastrutturali
Franco Bontempi
Professore Ordinario di Tecnica delle Costruzioni
Facolta’ di Ingegneria Civile e Industriale
Universita’ degli Studi di Roma La Sapienza

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Concepts

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Structural Robustness
ATTRIBUTE
S
RELIABILITY
AVAILABILITY
SAFETY
MAINTAINABILITY
INTEGRITY
SECURITY
FAILURE
ERROR
FAULT
permanent interruption of a system ability
to perform a required function
under specified operating conditions
the system is in an incorrect state:
it may or may not cause failure
it is a defect and represents a
potential cause of error, active or dormant
THREATS
4
NEGATIVE CAUSE
STRUCTURALQUALITY
more robust
less robust

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Performance layout
OBJECT
NET
Structural
System
Infrastructural
System
USE
SAFETY
INTEGRITY
f(D)
D
Mean
Frequent
Maximum
Rare
Accidental
Exceptional
BlackSwan
SLS
ULS
ILS

6. 6RESILIENCE
Life Cycle View

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RESILIENCERESILIENCE
CONSTRUCTIONS
NEW
EXISTING
COLLAPSED
“As Designed”
“As Built”
“As Actual”
“As Failed”
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CONSTRUCTIONS
NEW
EXISTING
COLLAPSED
DESIGN
ENVIRONMENT
/
BOUNDARY
CONDITIONS
FSI
“As Designed”
“As Built”
“As Actual”
“As Failed”
HPLC
LPHC
Black Swan
Conceptual Design
Innovatice Concepts
Structural Oprimization
Advanced Materials
Special Devices
Structural Control
Energy Harvesting
NATURAL
ANTROPIC
ACCIDENTAL
EXCEPTIONAL
SOIL - STRUCTURE
WIND - STRUCTURE
WAVE - STRUCTURE
ACTIONS
INTERACTIONS
GEOLOGICAL ASPECTS
EARTHQUAKES
Codes & Standards
Information Retrivial
Data Mining
Risk Analysis
Performance Based
Design
Dependability
Structural Identification
Structural Health Monitoring
Damage Assessment
Remaining Capacity
Structural Refurbishment
Structural Augmentation
Codes Compliance
Historical and
Monumental Costructions
Back Analysis
Forensic Engineering
Legal Issues
Components and Structures Testing
Experimental Design
Rapid Prototyping
Fire
Explosions
Activities

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Case

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Seismic Action

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Critical Node

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WU
WD
HY
CBCR
CU
RETAINING WALL UP (WU) RETAINING WALL DOWN (WD) HYDROELECTRIC POWER STATION (HY)
CONDUIT UP (CU) CONDUIT ROSALBA
CONDUIT PAVONCELLI BIS
1
2
3
4
5
6
7
1 2 3
4 5 6
7
HYDRAULIC JUNCTION
ELECTRICITY
WATER
Infrastructure plan view Individuation of the system/network components Representation of the system
Outputs
Node Congestion

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WU
WD
HY
CBCR
CU
(0,0) (92,0)
(92,29)
(0,29)
(0,54)
(0,62) (28.5,62)
(53,56)
(63,45)
(92,32)
(92,34)
System with Element connected in Series

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System with Element connected in Parallel

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Structural System Degradation

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Damage at Local Level

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Damage at Element Level

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Damage at Structural Level

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Design

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Concepts again

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Perrow
LINEAR interactions NONLINEAR
LOOSEcouplingsTIGHT
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FAR FIELD ZONE
EXCHAGE ZONE
STRUCTURE
FAR FIELD ZONE
EXCHAGE ZONE
STRUCTURE
INFRASTRUCTURE
OBJECT
NET
Local / Punctual
Scale
Global / Regional
Scale
Structural
System
Infrastructural
System
Holistic View
Also if artificial,
these systems
need to have
necessarily
evolutive soundness,
ecological coherence
and sustainability
characteristics

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Structural System

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ATTRIBUTES
THREATS
MEANS
RELIABILITY
FAILURE
ERROR
FAULT
FAULT TOLERANT
DESIGN
FAULT DETECTION
FAULT DIAGNOSIS
FAULT MANAGING
DEPENDABILITY
of
STRUCTURAL
SYSTEMS
AVAILABILITY
SAFETY
MAINTAINABILITY
permanent interruption of a system ability
to perform a required function
under specified operating conditions
the system is in an incorrect state:
it may or may not cause failure
it is a defect and represents a
potential cause of error, active or dormant
INTEGRITY
ways to increase
the dependability of a system
An understanding of the things
that can affect the dependability
of a system
A way to assess
the dependability of a system
the trustworthiness
of a system which allows
reliance to be justifiably placed
on the service it delivers
SECURITY
High level / active
performance
Low level / passive
performance
Dependability

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